Merge pull request #629 from kiwi-bdd/release/2.4.0

Bump to 2.4.0

update podspec to 2.3.1

update podspec for 2.3.0

Merge pull request #477 from modocache/revert-pull-request-427

Revert pull request #427.

Merge pull request #397 from cristiankocza/id-as-default-return-type

Using the objective-c default return type id instead of void for stubbed methods

Merge pull request #329 from allending/fix-nil-matcher

Report failures for tested nil subjects properly

updated podspec to 2.2

simplified